@AbundantLandUse @FreitasABR What makes you think air wouldn't come into a unit from hallways in 2001? The only way that wouldn't happen would be deliberate positive pressure in each unit which I doubt exists just about anywhere in the world. Usually it's the opposite.
@2001年，是什么让你认为空气不会从走廊进入一个单元？唯一不会发生这种情况的方法是在每个单元中故意施加积极压力，我怀疑这种压力在世界任何地方都存在。通常情况恰恰相反。